Hand brake



-fwW.

Inna/1:222

l atented Sept. 13, 1932 UNITED STATES ArENr Jessie fiAiaitis, onwfinhroninnmois, assieivoit'ro Wil -I. mate omelet; InLrNoi's, A ooaio'rmrroiv OEDELAWARE HANb' BRA E V Application filed neeemberfee, 1929]Serial No. 416,359."

This invention relates to improvements in hand brakes. a V 7 One objectof the invention is to provide a simple and efficient hand brake of thepower multiplying gear type, including a conical or tapered drum onwhich the brake chain is wound to provide for quicktakeup of the slackof the chain and brake mechanism at the initiation of the windingoperation, during which operation the chain'is wound on the largerdiameter :of the drum, followed by slower winding withyin'creased forceapplied to the brake mechanism by 'windingfoi the chain on that portionofthe d ruin which is of reduced diametenwherein the driving gears areso designed that they counterbalance the end thrust produced by thewinding of the chain, thereby greatly reducing the wear. incidentthereto on the bearings of the device and also overcoming the tendencyof distortion of the parts of the ino i ufting for the brake.

further ob"ec-t of the invention is to vide a hand brake including awinding drum,

power multiplying gearing for driving'the dru-m and a housing withinwhich the parts are enclosed, all so designed that the parts I tivfely.7 p p 7 A still further object of the invention is to,

may be readily and economically assembled.) the housing for this purposebeing composed of two, parts which are rigidly secured togetherjand theparts of which are provided a with alined sets of bearing means for thebearing elements at opposite ends of the winding drum and the drivinggear respeck provide a hand brake of the character described in thepreceding paragraph-including {a ratchet member-and cooperating pivot-;i ed dog for preventing retrograde movement o f'the winding drum,wherein the dog is provided with'trun'nions and the two sections of thehousing are provided with al-ined. pivot sockets accommodatingthetrunnions.

= l Otherobjects of the invention will more clearly ppear from thedescription and claims hereinafter following. 1 V- In the drawingforming a part of this specification, Figure =1-is a front elevationalView of my improved hand brake mechanism as shown in Figure l.Y'Ihebackwall l-l'is provided with three securing lugs Hi -15 wer end ofthe same. Any Qwell know'fi of a railway car, certain parts of the metaanism interiorly ofthehousing being "illus= trated in. dotted lin s.Figure'Q is a vertical-f; sectional view corresponding substantially tol the line 22of Figure 1. And Figure 3"isi a sectional view,' taken ontwo transverse" planes intersecting each other at an angle andcorresponding substantially to the line 33 of Figure 1. i V In saiddrawing, the end wall of the car is designated by 10 and serves as thesup porting means for'the housing of -my irnproved'han'd brakemechanisim In carrying out my invention, I providega housing of thesectional type=,.fpreferably composed of two :partsyas clearly shown inFigures 2 and 3. The housing com-prises back and front sectionsdesignated by 11 and 12 respectively. The back section of the housingcomprises avertical wall memberof plate-like form having spaced,laterally ex" tending, vertically *disposed'side "wallsec tions '13-13formed integral therewith; which side wall sectionsare connected "at jthe upper end by a curved top walll l, also formed integral with the plate likeb-ack wall 11. The walls 13 13 aiid'll and the ;con-. tour ofthe back 'wall "ll'a're substantially 15, one o zt'whichis "disposed atthe :ap'pe'r end ofthe plate and the remaining two of which are"disposed at "oppf'osite' -si desc at the type 'of securing means maybefiemjplojyed for fastening the section *11 oithe housing to a the endwall of the car; and-as hereinsho-wna the same is secured by rivetsextending through the-lugs 15 'andsaidend wan to of the car. Thefront'isectionof the housingv includes' a' front wall proper '16;"substantial ly parallel to the "back wall of the rearisec tion of "thehousing; 'andan' 'outward ly o'hfset portion 17 forming a pocket for apur- 95'- pose hereinafter pointed out. The-section 12 oi the housinghas vertically disposed curved side walls 181-8 formed-integraltherewith and in 'alinement with the f wall portions of the rear sectionof thehousi-ng. 1 01)..

As clearly shown in Figure 3, the walls 1313 of the rear section of thehousing are ofiset nwardly along their outer edges as indicated at 19l9'so that the inner edges of the walls18l8 of the outer section of thehousing; maybe telescoped thereover. In order to permanently secure theparts of the housing together, the telescoped portions of the walls1313and 18 18 are riveted to ened lug portion22,

gether, as" clearly shown" in Figures 1 and 2. The upper end portiorrofthe wall '16 is thickened,as indicated at 20, said thickened portionprojecting inwardly and hav-' "ing a bearing opening-21 thereinforapurpose hereinafterpomted out. The outer end of the top wall '14 oftherear section or the housing is provided with a dependingthiclzopening'in alinement with the opening 21 of h the front section-of the housing, said open- V ing-in the lug22 bemg'also designated by21. vThefront wall 16 of the outer section of the housin is providedwith an elongated.

hollow'boss 23 outwardly extending therefrom and formed inte raltherewith. The

hollow boss forms a bearing member for the 7 operating shaftof-myimproved bralre' mechanism, (as-hereinafter more fully pointed out. Therear wall of the inner section ofthe hous ing is provided with arelatively short inwardly projecting bearing boss 24, having a bearingopening in alinementwith the bearing'opening of the? boss 23. Thewalll'? of the pocket at the lower end of the outer section of thehousing is" also providedwitn an inwardly extending bossi25 and the wall11 f the inner section of the llOUSlIlgiS pro-;

vided with a similar boss 26 in alinement with. the boss 25, the bossesand '26 hav' ing alined bearing openings. {My-improved brake mechanismproper comprises broadly 'a winding drum A, a gear B. a pinion C,afdrive shaftcD, a hand wheel a-ratchet member F and alocking dog Gr. 1

The winding drum A is of conical form andhas a substantially spiralwinding groove 27 thereon. At the end of larger diameter,

7 the drum is provided with an outstanding lug 28 to which theend of thebrake chain s 26 'ofthefront and rearsections ofithe hous-' ingrespectively; I The gear B is preferably 29 is secured. As will beunderstood, the brake chain 29 is 'connected to the brake mechanism ofthe car, not-shown, in the usual,

manner- The brakedrum is provided with trun'nions 30i30 atfopp'ositeends thereof formed integral therewith and journaled in the-bearingopenings of the bosses 25 and formed integral with the drum Afl and islocated at the endfof the drum which is of larger diameter. Thegear B isof tapered or beveledform,as clearly shownin Figures '2 and 3 of the Idrawing.

Th'e pinion Cris fixed to the shaft D, which is rotatably journaled inthe bosses'or bear-' F fixed thereto with which the locking dog whichhas a bearing gravity.

- rams G cooperates. The locking dog is of bell crank form, one armthereof beingvprovided with p a tooth member 31 which cooperates withthe ratchet-Rand the other arm thereof being provided with amanipulating grip portion 82, The locking dog is provided with pivottrunnions 3333 at oppositesides 7.

thereof which are journaled in.- the" alined openings 21'21'of thefrontand rear sec-. tions of: the housingmAs, clearly showniin disposed'thatthe weight of the same urges the teeth of the dog into engagement withthe ratchet 'member F' byv the action of In assemblingvmy improved handbrakemechanism, the trunnion at the inner end of the brake drum isengaged within the bear ingboss 26 of the rear section-of thehousing,the innerend of the shaft D engaged within the bearing boss 24 of saidsection of the housing andthe inner trunnion of the locking dog engagedwithin the bearing opening 21 of said rear section. The front section ofthe housing is then applied, the shaft D being passed through thebearing Figure 1, the vhandle end of the dog. iszsoc member 23 and thefront trunnions 0t the winding drum A and the dog G engaged within thecorresponding bearing openings of the-front section. The parts of thehousing are then rivetedtogether, thereby securing all of the partspermanently in operative relation; I

The operation of my improved handbrake mechanism is as follows:' Inapplyingther brakes, the hand Wheel E is-rotated in a clockwisedirection, as viewed in Figure-1,-

thereby effecting rotation of th d i i pinion C which meshes with thegear B,

thereby rotating the latter in a contra-clock- 7 wise direction androtating'thed'rum'A therewith, thereby winding the chain 29 on the drum;Inasmuch-as the drum is of conical form and the brake chain is securedto that 7 portion thereof which is of larger diameter,

no I

a relatively rapid takeup of the brake chain is effected during theinitial chain winding-i operation due to the chainbeing wo'u'ndabout thelarger diameter of the drum; Theslackc in the brake chain and the brakemechanism is thus rapidly taken up: 7 During the furf ther braketightening operation, the chain 29 will be'wound about the conicaldrum',thereby greatly'increasing the power -durg-- mg the final application ofthe I brakes due,

to the chain being wound about the portion of the drum of decreasingdiameter. Inasmuch as the gear B is of much greater diameter than thedriving pinion, the power applied by the operatorto the hand Wheel Ewillbe greatly multiplied in the brake winding operation. The lockingdog G, which cooperates with the ratchet member F, prevents backwardmovement of the driving shaft D and through the intermeshing gears holdsthe chain winding drum A against movement in an unwindingdirection,

While the brake chain is being wound on the conical or tapered drum A, acertain amount of end thrust is produced tending to force the drum in alefthand direction, as viewed in Figure 2. The driving. pinion C and thecooperating gear B being reverse-.

ly beveled and the gear B having the bevel thereof tapered in adirection reversely to the taper of the winding drum, these intermeshinggears will counter balance the end thrust of the winding drum during thechain winding operation, the tendency of the inv termeshing gears beingto produce an end thrust'towar'd the right, as viewed in Figure 2, ofthe gear B and the brake drum which is fixed thereto. As will beevident, my improved arrangement of bevel gearing thus counterbalancesthe end thrust on the drum due to the Winding of the chain thereon,thereby greatly reducing the wear on the hearing members of the rotaryparts of the brake mechanism and further preventing distortion of thehousing dueto said end thrust.

When it is desired to release the brakes, the

operator disengages the dog G from the ratchet wheel, thereby permittingfree rota tion of the winding drum. In order to maintain the dogdisengaged from the ratchet wheel, the hand grip is thrown to the left,as seen in Figure 1, to suchan extent that it overbalances the toothed,end of the dog,

thereby maintaining the dogdisengaged through the action of gravity. Incase it is desired to back up the brakes, the hand wheel may be rotatedin a contra-clockwisedirection, as viewed in Figure 1, while the lookingdog is disengaged from the ratchet mem her.

I have herein shown and described what I now consider the preferredmanner of carrying out my invention, but the same is merely illustrativeand I contemplate all changes and modifications that come within,

a tapered drum on which the brake chainis Y wound; of a tapered gear ofrelatively large diameter fixed to the drum; a tapered drivdrum; andmeans for rotating said pinion .to wind the brake chain on the drum.

2. In a hand brake, thecombination with a tapered drum on which thebrake chain is 1 adapted to be wound; of a tapered gear of relativelylarge diameter fixed to the drum P at the end thereof of greatestdiameter; a

tapered driving pinion meshing with said ing said pinion to wind thebrake chain on the drum.

3. In a hand brake mechanism, the com-5 1 .bination with a two-parthousing comprisingfront and rear sectionsrigidly secured to'eachother,said housing sections having spaced front and rear wallsrespectively,

said rear wall having an inwardly opening bearing socket and said frontwall having-a bearing opening aligned with said socket;

of a chain-winding drum journaled in said front and rear wallsforrotation about an axis at substantially right angles to said v walls;a tapered gear fixed to the drum, said gear being-tapered toward saidrear wall; an

operating shaft having a hand wheel at the outer end, said shaftextending through and bemg ournaled in the bearing opening of said frontwall, said shaft having the inner end thereof journaled in the bearingsocket; tapered pinion fixed to said shaft, said; pinion meshing withsaid gear and being tapered in a direction reverse to the taper of saidgear, whereby the inner end of said shaft 1s held seated in said bearingsocket. V

In witness that I claim the foregoing I have hereunto subscribed mynamethis 23rd day of December 1929.

- Q J OSEPH HARRIS."

ing pinion meshing with said gear,said gear I

